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Note 8 - Capital Shares - Schedule of Options (Details) - $ / shares	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)	383,040	420,615	314,853
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)	328,388
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 24.93	$ 25.6	$ 32.62
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 24.93	$ 25.6	$ 32.62
Range One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)	374
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)	374
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 246.96
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Mar. 31, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 246.96
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Mar. 31, 2025
Range Two [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)	37,719
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)	37,719
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 15.12
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 15.12
Range Two [Member] | Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Aug. 31, 2027
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Aug. 31, 2027
Range Two [Member] | Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Dec. 31, 2028
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Dec. 31, 2028
Range Three [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)	43,031
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)	43,031
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 22.12
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Feb. 28, 2030
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 22.12
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Feb. 28, 2030
Range Four [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)	51,006
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)	51,006
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share)	$ 52.08
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share)	$ 56.49
Range Four [Member] | Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Sep. 30, 2030
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Sep. 30, 2030
Range Four [Member] | Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Oct. 31, 2030
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Oct. 31, 2030
Range Five [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)	81,041
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)	81,013
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share)	$ 36.75
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share)	$ 40.18
Range Five [Member] | Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Mar. 31, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Mar. 31, 2025
Range Five [Member] | Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Sep. 30, 2031
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Sep. 30, 2031
Range Six [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)	58,753
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)	52,957
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 25.97
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 25.97
Range Six [Member] | Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Mar. 31, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Mar. 31, 2025
Range Six [Member] | Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Feb. 28, 2032
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Feb. 28, 2032
Range Seven [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)	111,116
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)	62,288
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share)	$ 4.1
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share)	$ 10.01
Range Seven [Member] | Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Mar. 31, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Mar. 31, 2025
Range Seven [Member] | Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Oct. 31, 2033
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date	Oct. 31, 2033

X

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Date the equity-based award expires, in YYYY-MM-DD format.

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